Style Name dialog box
Insert > Text > Script > Script Wizard Effect - Rollovers – Cell rollover - Add button or Modify button
Name
Specifies the name of a cell rollover style. This name will appear in the Rollover styles list of the Cell Rollover dialog box. For this name, you can only use English letters, digits, and underscores(_). It is good for the name to begin with a letter from the English alphabet.